/*

 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message

 * Digest Algorithm, as defined in RFC 1321.

 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.

 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet

 * Distributed under the BSD License

 * See http://pajhome.org.uk/crypt/md5 for more info.

 */



/*

 * Configurable variables. You may need to tweak these to be compatible with

 * the server-side, but the defaults work in most cases.

 */

var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase        */

var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance   */

var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode      */



/*

 * These are the functions you'll usually want to call

 * They take string arguments and return either hex or base-64 encoded strings

 */

function hex_md5(s) { return binl2hex(core_md5(str2binl(s), s.length * chrsz)); }

function b64_md5(s) { return binl2b64(core_md5(str2binl(s), s.length * chrsz)); }

function str_md5(s) { return binl2str(core_md5(str2binl(s), s.length * chrsz)); }

function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }

function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }

function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }



/*

 * Perform a simple self-test to see if the VM is working

 */

function md5_vm_test()

{

    return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";

}



/*

 * Calculate the MD5 of an array of little-endian words, and a bit length

 */

function core_md5(x, len)

{

    /* append padding */

    x[len >> 5] |= 0x80 << ((len) % 32);

    x[(((len + 64) >>> 9) << 4) + 14] = len;



    var a = 1732584193;

    var b = -271733879;

    var c = -1732584194;

    var d = 271733878;



    for (var i = 0; i < x.length; i += 16)

    {

        var olda = a;

        var oldb = b;

        var oldc = c;

        var oldd = d;



        a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);

        d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);

        c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);

        b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);

        a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);

        d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);

        c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);

        b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);

        a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);

        d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);

        c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);

        b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);

        a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);

        d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);

        c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);

        b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);



        a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);

        d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);

        c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);

        b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);

        a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);

        d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);

        c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);

        b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);

        a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);

        d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);

        c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);

        b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);

        a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);

        d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);

        c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);

        b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);



        a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);

        d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);

        c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);

        b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);

        a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);

        d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);

        c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);

        b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);

        a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);

        d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);

        c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);

        b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);

        a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);

        d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);

        c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);

        b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);



        a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);

        d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);

        c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);

        b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);

        a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);

        d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);

        c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);

        b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);

        a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);

        d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);

        c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);

        b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);

        a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);

        d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);

        c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);

        b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);



        a = safe_add(a, olda);

        b = safe_add(b, oldb);

        c = safe_add(c, oldc);

        d = safe_add(d, oldd);

    }

    return Array(a, b, c, d);



}



/*

 * These functions implement the four basic operations the algorithm uses.

 */

function md5_cmn(q, a, b, x, s, t)

{

    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);

}

function md5_ff(a, b, c, d, x, s, t)

{

    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);

}

function md5_gg(a, b, c, d, x, s, t)

{

    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);

}

function md5_hh(a, b, c, d, x, s, t)

{

    return md5_cmn(b ^ c ^ d, a, b, x, s, t);

}

function md5_ii(a, b, c, d, x, s, t)

{

    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);

}



/*

 * Calculate the HMAC-MD5, of a key and some data

 */

function core_hmac_md5(key, data)

{

    var bkey = str2binl(key);

    if (bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);



    var ipad = Array(16),
        opad = Array(16);

    for (var i = 0; i < 16; i++)

    {

        ipad[i] = bkey[i] ^ 0x36363636;

        opad[i] = bkey[i] ^ 0x5C5C5C5C;

    }



    var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);

    return core_md5(opad.concat(hash), 512 + 128);

}



/*

 * Add integers, wrapping at 2^32. This uses 16-bit operations internally

 * to work around bugs in some JS interpreters.

 */

function safe_add(x, y)

{

    var lsw = (x & 0xFFFF) + (y & 0xFFFF);

    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);

    return (msw << 16) | (lsw & 0xFFFF);

}



/*

 * Bitwise rotate a 32-bit number to the left.

 */

function bit_rol(num, cnt)

{

    return (num << cnt) | (num >>> (32 - cnt));

}



/*

 * Convert a string to an array of little-endian words

 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.

 */

function str2binl(str)

{

    var bin = Array();

    var mask = (1 << chrsz) - 1;

    for (var i = 0; i < str.length * chrsz; i += chrsz)

        bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);

    return bin;

}



/*

 * Convert an array of little-endian words to a string

 */

function binl2str(bin)

{

    var str = "";

    var mask = (1 << chrsz) - 1;

    for (var i = 0; i < bin.length * 32; i += chrsz)

        str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);

    return str;

}



/*

 * Convert an array of little-endian words to a hex string.

 */

function binl2hex(binarray)

{

    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";

    var str = "";

    for (var i = 0; i < binarray.length * 4; i++)

    {

        str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +

            hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF);

    }

    return str;

}



/*

 * Convert an array of little-endian words to a base-64 string

 */

function binl2b64(binarray)

{

    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    var str = "";

    for (var i = 0; i < binarray.length * 4; i += 3)

    {

        var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16)

            |
            (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8)

            |
            ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);

        for (var j = 0; j < 4; j++)

        {

            if (i * 8 + j * 6 > binarray.length * 32) str += b64pad;

            else str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);

        }

    }

    return str;

}




export default hex_md5;